DEMO MANUAL DC2070A LTC5577 300MHz to 4GHz High Signal Level Active Downconverting Mixer Description Absolute Maximum Input Ratings Demonstration circuit DC2070A is optimized for evaluation of the LTC®5577 high signal level active downconverting mixer. Its RF input port is matched to 50Ω from 1.3GHz to 4.3GHz with 12dB return loss, and the LO port is matched to 50Ω from 950MHz to 4.1GHz with 10dB return loss. The RF and LO inputs are easily matched for higher or lower frequencies with simple external matching, as low as 350MHz and 300MHz, respectively. The low capacitance differential IF output is usable up to 1.5GHz. The LTC5577 active mixer is optimized for RF downconverting applications that require high input signal handling capability and wide bandwidth. Supply Voltage (VCC, IF +, IF –)......................................4V Enable Input Voltage (EN).................–0.3V to VCC + 0.3V LO Input Power (350MHz to 4.5GHz)....................10dBm LO Input DC Voltage................................................ ±0.1V RF Input Power (300MHz to 4GHz).......................18dBm RF Input DC Voltage................................................ ±0.1V TEMP Monitor Input Current...................................10mA Operating Temperature Range (TC)......... –40°C to 105°C Junction Temperature (TJ)..................................... 150°C Storage Temperature Range................... –65°C to 150°C Design files for this circuit board are available at http://www.linear.com/demo CAUTION: THIS PART IS SENSITIVE TO ELECTROSTATIC DISCHARGE (ESD). OBSERVE PROPER ESD PRECAUTIONS WHEN HANDLING THE LTC5577. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Board Photo Figure 1. Test Setup for Mixer 2-Tone Measurements dc2070af 1 DEMO MANUAL DC2070A Notes on Test Equipment and Setup n n High performance signal generators with low harmonic outputs should be used for 2-tone measurements. Otherwise, low pass filters at the signal generator outputs should be used to suppress harmonics. High quality combiners should be used to present a broadband 50Ω termination on all ports as well as provide good port-to-port isolation. Attenuator pads should be used on the inputs to the combiner and the RF input port of the LTC5577 mixer, as shown in Figure 1. Adding attenuator pads further improves source isolation and helps prevent the signal generators from producing intermodulation products. n n Spectrum analyzers can produce significant internal distortion products if they are overdriven. Generally, spectrum analyzers are designed to operate at their best with about –30dBm to –40dBm at their input. The spectrum analyzer’s input attenuation setting should be used to avoid saturating the instrument. Set the spectrum analyzer’s input attenuation depending on the spectrum analyzer used. Before performing measurements on the DUT, the system performance should be evaluated to ensure that a clean input signal is obtained and that the spectrum analyzer’s internal distortion is minimized Parts List ITEM QTY 1 4 REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER C1, C2, C7, C8 CAP, 1nF, 10%, 16V, X7R, 0402 MURATA, GRM155R71C102KA01D 2 1 C3 CAP, 8.2pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1H8R2CA01D 3 1 C4 CAP, 0.7pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1HR70BB01D 4 1 C5 CAP, 3.9pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1H3R9BB01D 5 0 R3, L4, L5, L6, C6, C10, C11, C12, C13 COMP, 0402, OPT 0402 6 1 C9 CAP, 1µF, 10%, 10V, X7R, 0603 MURATA, GRM188R61A105KA61D 7 3 E1, E3, E4 TURRET, PAD, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 8 1 E2 TURRET, PAD, 0.061" MILL-MAX, 2308-2-00-80-00-00-07-0 9 4 J1-J4 CONN, SMA, 50Ω, EDGE-LAUNCH E.F. JOHNSON, 142-0701-851 10 2 L1, L2 IND, 560nH, 2%, 0603 COILCRAFT, 0603LS-561XGL 11 2 R1, R2 RES, CHIP, 115, 1%, 0402 VISHAY, CRCW0402115RFKED 12 1 U1 IC, LINEAR TECHNOLOGY, LTC5577IUF, QFN16, 4×4 LINEAR TECHNOLOGY, LTC5577IUF Quick Start Procedure 1. Set the power supply output voltage to 3.3V and the current limit to 250mA. Turn off the power supply output. 2. Connect all test equipment and the power supply as shown in Figure 1. 2 3. Ramp on the power supply with a minimum ramp time of 1ms. 4. Set the LO signal generator to provide an 1800MHz CW signal at about 0dBm at the DC2070A’s LO port. dc2070af DEMO MANUAL DC2070A Quick Start Procedure 5. Set the two RF signal generators to provide one 1949MHz CW signal and one 1951MHz CW signal. The signals should be applied to the 0° combiner. The power applied to the DC2070A’s RF input port should be about –3dBm/tone. 6. Perform various measurements (conversion gain, IP3, LO leakage, etc.). 7. To turn off the DC2070A, either turn off the power supply’s output, or remove the power leads starting with the EN lead. Schematic Diagram Figure 2. High Signal Level Active Mixer dc2070af 3 DEMO MANUAL DC2070A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 4 dc2070af Linear Technology Corporation LT 1113 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013